The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.80c with respect to the inertial frame of reference?
a. 1.6 s
c. 2.5 s
b. 1.2 s
d. 3.3 s
D
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The charge of a proton is due to
A. rapid spinning of the proton. B. the high density of the proton. C. reasons physicists are not yet quite sure of, but they explain charge as a property of the proton. D. periodic pulsations of the surface of the proton.
What did the Greek philosopher Philolaus believe about the Universe? a. No parallax seen of new stars means Earth is the center of the Universe. b. Perfect heavens must be made of up spheres rotating at constant rates. c. The most perfect geometrical form was the sphere
d. The heavens are perfect and Earth is imperfect. e. Earth moved around a central fire.
A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?
A. ?8.9 J B. ?7.3 J C. ?8.1 J D. ?6.6 J E. ?24 J
A 5.00-kg object moves clockwise around a 50.0 cm radius circular path. At one location, the speed of the object is 4.00 m/s
When the object next returns to this same location, the speed is 3.00 m/s. (a) How much work was done by non-conservative forces as the object moved once around the circle? (b) If the magnitude of the above non-conservative forces acting on the object is constant, what is the minimum value of this magnitude?